Noble internal transport barriers and radial subdiffusion of toroidal magnetic lines

Details Noble internal transport barriers and radial subdiffusion of toroidal magnetic lines Noble internal transport barriers and radial subdiffusion of toroidal magnetic lines

2002-05-31

arxiv.org/abs/physics/0206001v1

Physics

Plasma Physics

TEX file, 84 pages including 32 color figures. Higher quality figures can be seen on the PDF file at http://membres.lycos.fr

Scientific paper

Single trajectories of magnetic line motion indicate the persistence of a central protected plasma core, surrounded by a chaotic shell enclosed in a double-sided transport barrier : the latter is identified as being composed of two Cantori located on two successive "most-noble" numbers values of the perturbed safety factor, and forming an internal transport barrier (ITB). Magnetic lines which succeed to escape across this barrier begin to wander in a wide chaotic sea extending up to a very robust barrier (as long as L<1) which is identified mathematically as a robust KAM surface at the plasma edge. In this case the motion is shown to be intermittent, with long stages of pseudo-trapping in the chaotic shell, or of sticking around island remnants, as expected for a continuous time random walk.

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